Method for casting surrounding concrete of lined steel pipe of shield tunnel

Abstract

The invention discloses a method for casting surrounding concrete outside of a lined steel pipe of a shield tunnel. The method comprises the following steps: transporting and installing a steel pipe in a finished shield tunnel, and arranging a pump truck outside a receiving well; sealing the full annular surface in different cabins at the bottom of the butted steel pipe by using a quickly and easily-folded net, and dividing the space into multiple casting cabins; setting a slurry filling hole on the steel pipe of each casting cabin, and communicating the slurry filling hole with the concrete pump truck; pumping the self-dense concrete by the pump truck, and casting in multiple casting cabins from the receiving well toward a start well in a step manner layer by layer until the casting of the surrounding concrete of the pipeline in the whole tunnel is finished. Through the method disclosed by the invention, the quality of the concrete casting can be well controlled. Furthermore, as the steel pipe is transported from the start well, and the concrete is pumped from the receiving well, the installation of the steel pipe does not influence the casting construction of the surrounding concrete, and the work period can be shortened effectively.

Description

technical field [0001] The invention relates to a pouring method for lining steel pipes and outsourcing concrete in a shield tunnel. Background technique [0002] Self-compacting concrete is mostly used in complex structures where high fluidity concrete is difficult to pour, and it is more common in concrete above C40. In hydraulic tunnels, it is more common to use the new Austrian method to line the tunnel with PCCP pipes. Since the gap between the lining pipe and the buried tunnel can reach 500mm~600mm, the space is large, which is conducive to concrete filling construction and can effectively ensure The pouring quality of outsourcing concrete, and the use of wooden formwork and steel formwork as formwork is easy to disassemble and assemble, so self-compacting concrete pouring construction is widely used. [0003] At present, after the completion of the shield tunnel, there is no successful precedent for lining steel pipes in the shield segment tunnels and backfilling low...

AI Technical Summary

Problems solved by technology

[0003] At present, after the completion of the shield tunnel, there is no successful precedent for lining steel pipes in the shield segment tunnels and backfilling low-strength self-compacting concrete when the gap between the lining steel pipes and the segments is small. It is due to the following shortcomings in the ultra-long-distance low-strength self-compacting concrete construction process in a narrow space: (1) The homogeneity and compactness of the backfill concrete cannot be guaranteed; (2) The problem of steel pipes floating during the outsourcing concrete pouring process (3) The grouting method of self-compacting concrete pouring construction is unreasonable

In addition, the pouring of outsourcing concrete with steel pipes lining the shield tunnel will also interact with the installation of the pipes, which will seriously affect the construction period

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